JPH11182459A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor which is lubricated by lubricating oil to be fed out of a thrust surface lying between a supporting frame and an end plate as a sliding part of a first key of an Oldham's ring is situated in the lower part than the thrust surface lying between the supporting frame and the end plate of a rocking scroll. SOLUTION: This scroll compressor is provided with a first key 22A, extending from a fixed scroll 15A, and projecting into the lower part than a thrust surface lying between a supporting frame 8 and an end plate 12, and it is also equipped with a groove 29 to be fitted in this first key 22A in an Oldham's ring, while a second key 23 to be fitted in a side groove 25 of a rocking scroll 11 in a position orthogonal with this groove 29. The fixed scroll 15A is formed as being divided from the first key 22A, and equipped with a connection (projection) connecting this first key 22A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for a vacuum pump, an air pump, a refrigerator, an air conditioner, and the like.

[0002]

2. Description of the Related Art Conventionally, a scroll type compressor 1A used in a refrigeration cycle of an air conditioner or the like has a structure shown in FIG. 9, for example. An electric element 2 and a scroll compression element 3 are incorporated inside a cylindrical closed container 1 having both ends closed. The electric element 2 includes a stator 4 fixed to the inner wall surface side of the closed container 1 and a rotor 5 rotatably supported inside the stator 4, and a rotary shaft 6 penetrates the rotor 5. Is joined to. The crank portion 7 of the rotating shaft 6 is rotatably supported by a support frame 8 which forms a part of the scroll compression element 3. The other end of the rotating shaft 6 is connected to the rotor 5
, And its tip is extended downward so as to be immersed in the lubricating oil b contained in the closed container 1. An oil passage 9 for sucking and supplying the lubricating oil b is bored in the rotating shaft 6 in the axial direction, and the lubricating oil passes through the oil passage 9 to each sliding portion such as the support frame 8. After being supplied, it is recirculated.

[0003] One end of the rotary shaft 6 supported so as to penetrate the support frame 8 is formed as an eccentric portion 10 whose center is provided eccentrically with the axis of the rotary shaft 6. An orbiting scroll 11 is connected to the eccentric part 10. The orbiting scroll 11 has a boss hole 13 to which the eccentric part 10 is connected at the center of one side surface of the end plate 12 formed in a disk shape. A spiral wrap 14 is integrally formed on the other side surface of the end plate 12 of the orbiting scroll 11. A fixed scroll 15 is fixedly connected to the support frame 8. A spiral wrap 16 is formed in the fixed scroll 15 at a portion facing the orbiting scroll 11, and a plurality of compression chambers 17 are formed between the fixed scroll 15 and the wrap 14. These compression chambers 17 suck the refrigerant gas at the outer peripheral portion via a suction pipe 18 and gradually move to the center to reduce the volume and compress the refrigerant gas. The lubricant is discharged from the discharge port 19 provided at the center of the side surface into the high-pressure space in the closed casing 1, the accompanying lubricating oil is separated, the pulsation is reduced, and the discharge is performed from the discharge pipe 20. Fixed scroll 15 and oscillating scroll 11 constituting scroll compression element 3
An Oldham ring 21 is interposed between the fixed scroll 15 and the Oldham ring 21 so as to revolve on a circular orbit so that the orbiting scroll 11 does not rotate with respect to the fixed scroll 15 by driving the electric element 2. Has become.

FIG. 10 is an enlarged explanatory view showing the vicinity of the scroll compression element 3 of the scroll compressor 1A shown in FIG. 9, and FIG. 11 is a perspective view of the Oldham ring 21. The Oldham ring 21 is integrally provided with two first keys 22 and two second keys 23 so as to protrude upward on the same plane side. The pair of first keys 22 orthogonal to the second keys 23 are higher than the second keys 23 (Japanese Patent Laid-Open No. 2-227581). And
The first key 22 is fitted in the side groove 24 of the fixed scroll 15, and the second key 23 is fitted in the side groove 25 of the orbiting scroll 11. Lubricating oil supplied from the oil passage 9 of the rotary shaft 6 through the shaft hole provided in the eccentric portion 10 slides on the inner and outer surfaces of the boss hole portion 13 in the sliding portion of the first key 22 and the second key 23. Through the portion, it communicates with the inner space of the support frame 8, and is further lubricated by the lubricating oil partially flowing out through the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11. Since the surface 26 of the Oldham ring 21 is located below the thrust surface of the support frame 8 and the end plate 22 of the orbiting scroll 11 due to its mechanism, the lubricating oil falls below the thrust surface and is located above the thrust surface. Lubricating oil is difficult to go to each key.
Since the key 22 is higher than the second key 23, there is a problem that lubrication is not sufficiently performed. The radial length L of the second key 23 of the conventional Oldham ring 21 is
Since the length W of the Oldham ring 21 provided with the second key 23 is the same as the length W in the radial direction (L = W), it is difficult to obtain a sufficient sliding area.

[0005]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a scroll compressor in which the first key 22 of the Oldham ring 21 is sufficiently lubricated. The purpose of 2 is to provide the second key 23 of the Oldham ring 21 with a sufficient sliding area to lower the PV value,
An object of the present invention is to provide a scroll compressor with improved sliding conditions.

[0006]

According to a first aspect of the present invention, there is provided a swinging mechanism which is arranged so as to be meshed with a fixed scroll and surrounded by the fixed scroll and a support frame. A drive mechanism having a scroll and an Oldham ring-oscillating scroll coupling means by means of an Oldham ring arranged in parallel with the end plate of the orbiting scroll, for preventing rotation of the orbiting scroll and revolving with respect to the fixed scroll A first key extending from the fixed scroll and projecting below a thrust surface of the support frame and the end plate of the orbiting scroll, and the first key is provided on the Oldham ring. And a groove that fits with the side groove of the orbiting scroll at a position orthogonal to the groove. It is characterized in that it comprises an Oldham ring with 2 keys. Since the sliding portion of the first key protruding downward from the fixed scroll is located below the thrust surface between the support frame and the end plate of the orbiting scroll, it is lubricated by the lubricating oil supplied from the thrust surface. The lubrication characteristics are improved.

According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the fixed scroll comprises:
The first key is formed separately from the first key.
It is characterized by comprising a coupling part for coupling keys.

According to a third aspect of the present invention, in the scroll compressor according to the second aspect, the first key is formed of a wear-resistant member. The material of the first key is selected from the casting, sintered material, aluminum material and other abrasion-resistant materials corresponding to the material of the Oldham ring. The reliability of the sliding portion between the ring and the first key can be improved.

According to a fourth aspect of the present invention, in the scroll compressor according to any one of the first to third aspects, the second key has a radial end face located closer to an inner peripheral face of the Oldham ring. It is characterized by projecting inward.

According to a fifth aspect of the present invention, there is provided a fixed scroll, an orbiting scroll which is meshed with the fixed scroll and surrounded by the fixed scroll and a support frame, and which is parallel to the end plate of the orbiting scroll. A scroll compressor having an Oldham ring-oscillating scroll coupling means by means of an Oldham ring disposed on the scroll compressor and having a drive mechanism for preventing rotation of the orbiting scroll and revolving with respect to the fixed scroll. A first key fitted into a side groove of the fixed scroll,
A second key provided orthogonally to the first key and fitted in a side groove of the orbiting scroll, wherein a radial end face of the second key projects inward from an inner peripheral surface of the Oldham ring. It is a scroll compressor characterized by these.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS. FIG. 1 is an enlarged explanatory view showing a main part of a compression element 3A in a scroll compressor 1B of the present invention, and FIG. 2 is a perspective view of a fixed scroll 15A of the compression element 3A in a scroll compressor 1B of the present invention. FIG. 3 is a perspective view of the Oldham ring 21A of the compression element 3A in the scroll compressor 1B of the present invention. The first key 22A is used for the fixed scroll 15
A has a female screw hole (not shown) in a direction parallel to the axial direction of the rotating shaft 6. A U-shaped convex portion 27 for inserting and fixing the first key is provided on the fixed scroll 15A side so as to face each other, and the U-shaped convex portion 27 is provided.
A bolt through hole (not shown) is provided at the top of the fixed scroll 15A using a bolt 28.
It is fixed integrally to. Fixed first key 22A
Extends downward from the fixed scroll 15A and protrudes below the thrust surface of the support frame 8 and the end plate 12 of the orbiting scroll 11. And Oldham Ring 2
1A is provided with a groove 29 to be fitted to the first key 22A, and a second key 23 to be fitted to the side groove 25 of the orbiting scroll 11 is provided at a position orthogonal to the groove 29. Since the sliding portion of the first key 22A protruding below the fixed scroll 15A is located below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, lubricating oil supplied from the thrust surface , Lubrication characteristics are improved.

FIG. 4 shows another scroll compressor 1 of the present invention.
FIG. 5 is an explanatory view showing an enlarged main part of the compression element 3B in C, and FIG. 5 is a perspective view of a fixed scroll 15B of the scroll compression element 3B in another scroll compressor 1C of the present invention. The first key 22B is used for the fixed scroll 15
B, the first key 22B is provided with a bolt through hole (not shown) in a direction orthogonal to the axial direction of the rotating shaft 6. The fixed scroll 15B side has a joint surface for coupling only to one side surface of the first key 22B, and a bolt female screw (not shown) for fastening the first key 22B through the bolt through hole is provided. Convex part 30
The first key 22B is integrally fixed to the fixed scroll 15B using a bolt 28. The Oldham ring uses the Oldham ring 21A shown in FIG. The Oldham ring 21A is provided with a groove 29 for fitting with the first key 22B.
At a position orthogonal to the groove 29, a second key 23 that fits into the side groove 25 of the orbiting scroll 11 is provided. Since the sliding portion of the first key 22B projecting below the fixed scroll 15B is located below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, lubricating oil supplied from the thrust surface Is lubricated by
Lubrication characteristics are improved. Since the first key 22B is fixed by the bolt 28 in a direction orthogonal to the axial direction of the rotating shaft 6, the mounting strength is large, and the first key 22B is stably fixed without tilting during operation.

FIG. 6 shows another scroll compressor 1 of the present invention.
FIG. 7 is an enlarged explanatory view showing a main part of the scroll compression element 3C in D. FIG. 7 is a perspective view of a fixed scroll 15C of the scroll compression element 3C in another scroll compressor 1D of the present invention. The first key 22C is formed separately from the fixed scroll 15C.
Is provided with a bolt through hole (not shown) in a direction orthogonal to the axial direction of the rotating shaft 6. On the fixed scroll 15C side, a groove 31 for sandwiching and connecting the first key 22C is provided.
The groove 31 is provided with a female screw hole (not shown) on one side surface 32 and a convex portion provided with a bolt through hole (not shown) on the other side surface 33, and the first key 22C is provided with a bolt 28. And is integrally fixed to the fixed scroll 15C. The Oldham ring uses the Oldham ring 21A shown in FIG. And Oldham Ring 2
1A is provided with a groove 29 for fitting with the first key 22C, and a second key 23 for fitting into the side groove 25 of the orbiting scroll 11 is provided at a position orthogonal to the groove 29. Since the sliding portion of the first key 22C protruding below the fixed scroll 15C is located below the thrust surface between the support frame 8 and the end plate 12 of the orbiting scroll 11, lubricating oil supplied from the thrust surface , Lubrication characteristics are improved. The first key 22C is sandwiched in the groove 31 and is fixed by bolts 28 in a direction perpendicular to the axial direction of the rotating shaft 6, so that the mounting strength is further increased, and the first key 22C is stably prevented from tilting during operation. Fixed.

FIG. 8 is a perspective view of an Oldham ring 21B of a scroll compression element in another scroll compressor (not shown) of the present invention. The radial length L1 of the second key 23A of the Oldham ring 21B is the radial length W of the Oldham ring 21B provided with the second key 23A.
By making it larger (L1> W), the radial side end surface of the second key 23A protrudes inward from the inner peripheral surface of the Oldham ring 21B. The configuration is the same as that of the Oldham ring 21 shown in FIG. 11 except that the radial side end surface of the second key 23A projects inward from the inner peripheral surface of the Oldham ring 21B. A scroll compressor element of another scroll compressor (not shown) of the present invention is the same as the scroll compressor 3 shown in FIG. 10 except that this Oldham ring 21B is used. Since the radial end surface of the second key 23A is projected inward from the inner peripheral surface of the Oldham ring 21B, a sufficient sliding area can be obtained, the PV value can be reduced, and the sliding conditions can be improved.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0016]

According to the scroll compressor of the present invention, the sliding portion of the first key of the Oldham ring is located below the thrust surface between the support frame and the end plate of the orbiting scroll, so that the support frame and the orbiting scroll can be moved. Since the lubricating oil is supplied by the lubricating oil supplied from the thrust surface of the orbiting scroll with the end plate, the lubricating characteristics are improved. If the first key is fixed by bolts in a direction perpendicular to the axial direction of the rotating shaft, the mounting strength is large and the first key does not tilt during operation. If the first key is sandwiched between the grooves and fixed with bolts in a direction perpendicular to the axial direction of the rotating shaft, the mounting strength is further increased. First
Casting the key material to match the material of the Oldham ring,
By selecting the best wear-resistant material such as sintered material or aluminum material, it is possible to improve the reliability of the sliding part between the Oldham ring and the first key that has a small load area against the load and severe lubrication conditions. . If the radial end surface of the second key of the Oldham ring protrudes inward from the inner peripheral surface of the Oldham ring, a sufficient sliding area is obtained, and the PV value is reduced.
Sliding conditions can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an enlarged main part of a scroll compressor of the present invention.

FIG. 2 is a perspective view of a fixed scroll of the scroll compressor of the present invention shown in FIG.

FIG. 3 is a perspective view of an Oldham ring of the scroll compressor of the present invention shown in FIG.

FIG. 4 is an enlarged explanatory view showing a main part of another scroll compressor of the present invention.

FIG. 5 is a perspective view of a fixed scroll of another scroll compressor of the present invention shown in FIG.

FIG. 6 is an explanatory view showing an enlarged main part of another scroll compressor of the present invention.

FIG. 7 is a perspective view of a fixed scroll of another scroll compressor of the present invention shown in FIG.

FIG. 8 is a perspective view of an Oldham ring (not shown) of another scroll compressor of the present invention.

FIG. 9 is an explanatory sectional view of a conventional scroll compressor.

FIG. 10 is an enlarged explanatory view showing the vicinity of a scroll compression element of the conventional scroll compressor shown in FIG.

FIG. 11 is a perspective view of an Oldham ring of the conventional scroll compressor shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A Scroll compressor 1B, 1C, 1D Scroll compressor 1 Airtight container 2 Electric element 3, 3A, 3B, 3C Scroll compression element 4 Stator 5 Rotor 6 Rotating shaft 7 Crank part 8 Support frame 9 Oil passage 10 Eccentric part 11 Oscillation Moving scroll 12 End plate 13 Boss hole 14, 16 Wrap 15, 15A, 15B, 15C Fixed scroll 21, 21A, 21B Oldham ring 22, 22A, 22B, 22C First key 23, 23A Second key 24 Fixed scroll side groove 25 Side groove of orbiting scroll 26 Plane of Oldham ring 27 U-shaped convex part 28 Bolt 29 Groove 30 Convex part 31 Groove for coupling 32 Side surface side 33 The other side surface

Continued on the front page (72) Inventor Yasunori Kiyokawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoshinori Noboru 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A fixed scroll, an oscillating scroll that meshes with the fixed scroll and is disposed surrounded by the fixed scroll and a support frame, and an Oldham ring that is disposed parallel to a head plate of the oscillating scroll. A scroll compressor having an Oldham ring-oscillating scroll coupling means and a drive mechanism for preventing rotation of the orbiting scroll and performing revolving motion with respect to the fixed scroll; And a first key protruding below the thrust surface of the orbiting scroll with the end plate. The Oldham ring is provided with a groove to be fitted with the first key. Scroll pressure comprising an Oldham ring having a second key fitted into a groove of a moving scroll. Contractor. 2. The scroll compressor according to claim 1, wherein the fixed scroll is formed so as to be divided from the first key, and further includes a coupling unit that couples the first key. 3. The scroll compressor according to claim 2, wherein the first key is formed of a wear-resistant member. 4. The scroll compressor according to claim 1, wherein the second key has a radial end face protruding inward from an inner peripheral face of the Oldham ring. . 5. A fixed scroll, an oscillating scroll meshing with the fixed scroll and surrounded by the fixed scroll and a support frame, and an Oldham ring arranged in parallel with a head plate of the oscillating scroll. An Oldham ring-oscillating scroll coupling means, and a scroll compressor having a drive mechanism for preventing the orbiting scroll from rotating and revolving with respect to the fixed scroll, wherein the Oldham ring is provided in a groove of the fixed scroll. A first key to be fitted, and a second key provided to be orthogonal to the first key and fitted to a side groove of the orbiting scroll, wherein a radial end face of the second key is formed on an inner periphery of the Oldham ring. A scroll compressor characterized by projecting inward from a surface.